*Yukihiro Nakatani¹, Hirotsugu Yanagida¹, Hiroshi Yakiwara¹, Shuichiro Hirano¹, Yusuke Yamashita², Takeshi Matsushima³, Kazuo Nakahigashi⁴, Masanao Shinohara⁵ (1.Nansei-Toko Observatory for Earthquakes and Volcanoes, Kagoshima University, 2.Disaster Prevention Research Institute, Kyoto University, 3.Institute of Seismology and Volcanology, Kyushu University, 4.Tokyo University of Marine Science and Technology, 5.Earthquake Research Institute, the University of Tokyo)